Gael ludwig mitller



UNITED STATES PATENT OFFICE.

CARL LUDVVIG MI TLLER, OF LUDWIGSHAFENON-THE-RHINE, BAVARIA, GER- MANY, ASSIGNOR TO THE BADISCHE ANILTN AND SODA FABRIK, OF MANNI-IEIM, GERMANY.

MANUFACTURE OF SULPHONATED PURPLE DYE-STUFF S FROM BASIC ROSANILINE.

SPECIFICATION forming part of Letters Patent No. 353,265, dated November 23, 1886.

Application filed September 25, 1886. Serial No. 214,548. (Specimens) To all whom it may concern: cal results are obtained by treating the said Be it known that I, CARL LUDWIG MULLER, basic coloring-matter with fuming sulphuric a subject of the King of Bavaria, residing at acid at a temperature requiring to be regu- Ludwigshafen-on-the-Rhine,in the Kingdom of lated according to the strength of the sulphuric Bavaria and Empire of Germany, have iuacid employed. The action of rectified sulvented new and useful Improvements in the phuric acid produces inferior results on ac- Manufactnre of a Sulphonated Purple Dyecount of its requiring the assistance of a tem- Stuff or Coloring-Matter from the Basic Rosaniperature exceeding 100 centigrade, and thus line Derivative Resulting from the Condensaliable of injuring the coloring-matter, while 10 tion of Tetraethyldiamidobenzophenone with fuming sulphuric acid effects the desired sul- 6o Benzyldiphenylamine, of which the following phonization at a considerably lower temperais a specification. ture and even without any external applica- This invention relates to the manufacture of tion of heat. a sulphonated purple dye-stufi or coloring- As an example, I proceed as follows: About 5 matter from the basic rosaniline derivative retwo parts, by weight, of the basic rosaniline sulting from the condensation of tetraethylderivative (produced, as before described, by diamidobenzophenone with benzyldiphenylathe condensation of tetraethyldiamidobenzomine. phenone with benzyldiphenylamine) are added I11 carrying out my invention, I take about in the cold in the state of a dry powder, and

20 ten parts, by weight, of tetraethyldiamidobeuunder constant agitation in very small porr zophenone, and mix the same intimately with tions at a time, to about nine parts, by weight, eight parts, by weight, of benzyldiphenylaof fuming sulphuric acid containing about mine and one part, by weight, of toluol. I then twenty-three per centum of free sulphuric anqnickly add four parts, by weight, of oxychlo hydride. The acid-mixture isexternally sur- 25 ride of phosphorus. The mixture thus prorounded with ice, and care is taken to prevent duced is then heated under constant agitation any rise of its temperature beyond 10 centiuntil its inside temperature has reached 100 grade. The solution thus obtained, after becentigrade, at which temperature it is to be .ing first allowed to stand at a temperature of kept during the space of about from six toabout from 15 to 20 centigrade during the 0 eight hours. The bronze-colored melt thus space of about twelve hours, is afterward careobtained is boiled with about two hundred fully diluted with about thirty times its own parts of water, with the addition of as much volume of ice-cold'water, and the precipitate hydrochloric acid as will be found necessary of the free sulpho'acid thus produced is then for rendering the coloring-matter soluble. The dissolved on the water bath with a slight ex- 5 resulting acid solution is filtered, diluted with cess of caustic-soda liquor, and the alkaline E 5 its own volume of water, and the free hydrosolution, after being filtered and carefully neuchloric acid contained in the same is partly tralized with muriatic acid, is precipitated neutralized with acetate of soda, and then a with common salt. The fiocculent precipitate solution of common salt is added in sufficient thus obtained is then filtered, pressed, and

40 quantity to precipitate the dye-stufi'. The redried.

sulting precipitate is filtered, pressed, and The sulphonated dye-stuff or coloring-matdried. ter produced in the usual mercantile form of In order to convert the basic rosaniline dea'sodium salt, asbefore described, presents the rivative thus produced (and which, according following characteristics. It has the appear- 5 to its chemical composition, may be called a ande of adark-bluepowderpossessingabronzetetraethyl benzylphenyl para-rosaniline like luster, easily soluble in water with a bright into my new sulphonated coloring-matter posbluish purple color. By the addition of cans sessing acid properties, and therefore capable tic alkalies the said purple color of the aqueof dyeing in an acid bath, the known methods ous solution becomes gradually destroyed; but

50 of sulphonization may be employed. Practiit is restored upon neutralizing the free alkali no with a mineral or organic acid. Rectified sulphuric acid dissolves the dye-stuff with a yellow-red color,which upon the addition of water turns blue, at dark-blue precipitate of the free sulpho-acid being formed at the same time. Strong hydrochloric acid producesa red-brown solution. By submitting an intimate mixture of the dye-stuff with caustic lime to destructive distillation a basic oil distils over, possessing a characteristic disagreeable smell, and

partly insoluble in dilute hydrochloric acid,-

the insoluble portion of the same developing a blue color in the presence of nitric acid.

The new dye-stuff, if employed in the processes of dyeing and printing in a similar manner as the hitherto known sulphonated coloring-matters, is capable of imparting to animal fiber abright bluish purple color, resisting the action of acids. The above-described chemical properties of my new sulphonated dye stuff are similar to those of its lower homologue produced in an analogous manner from tetramethyldiamidobenzophenone and benzyldiphenylamine, and which coloring -matter forms the subject-matter of separate application for Letters Patent by myself jointly with Henry Bull. From the said lower homologue it may, however, be easily distinguished by the considerably bluer shade which it produces in dyeing and printing.

' WVhat I claim as new, and desire to secure 

